[TSVB] Y-axis has number formatting not considering all series format…

…ters in the group (elastic#83438)

* [TSVB] Y-axis has number formatting not considering all series formatters in the group

* Replace check for percent with a check for same formatters in common

* Remove unnecessary series check

src/plugins/vis_type_timeseries/public/application/components/vis_types/timeseries/vis.js

@@ -169,6 +169,10 @@ export class TimeseriesVisualization extends Component {
     const yAxis = [];
     let mainDomainAdded = false;
 
+    const allSeriesHaveSameFormatters = seriesModel.every(
+      (seriesGroup) => seriesGroup.formatter === seriesModel[0].formatter
+    );
+
     this.showToastNotification = null;
 
     seriesModel.forEach((seriesGroup) => {
@@ -219,7 +223,7 @@ export class TimeseriesVisualization extends Component {
         });
       } else if (!mainDomainAdded) {
         TimeseriesVisualization.addYAxis(yAxis, {
-          tickFormatter: series.length === 1 ? undefined : (val) => val,
+          tickFormatter: allSeriesHaveSameFormatters ? seriesGroupTickFormatter : (val) => val,
           id: yAxisIdGenerator('main'),
           groupId: mainAxisGroupId,
           position: model.axis_position,